摘要
在时间频率双选择衰落信道情况下,提出了一种对抗载波间干扰(ICI)和符号间干扰(ISI)的加权型分数阶傅里叶(weighted-type fractional Fourier transform,WFRFT)变换系统,分析了WFRFT变换系统性能,以及载波频率偏移对系统的影响。在复杂信道环境下,我们推导出WFRFT变换系统的信号干扰比公式,表明WFRFT变换系统受到的ICI干扰介于单载波和多载波系统之间。同时仿真分析了单载波系统、OFDM系统和WFRFT变换系统的误码率特性。仿真结果表明,当存在频偏时,最优分数阶变换系统性能明显优于单载波系统和OFDM系统。
In this paper, we analyzed the effects of carrier frequency offset for Weighted fractional Fourier transform (WFRFT) system under the time frequency fading channel. The expression of signal-to-interference ratio (SIR) due to inter-carrier interference (ICD and intersymbol interferenee (ISI) is derived and the bit error rate (BER) performance of the BPSK modulation scheme are simulated for single-carrier (SC), OFDM and WFRFT-OFDM systems respectively. Simulation results show that when carrier offset exists, the WFRFT system has superiority over both SC and OFDM systems after choosing an optimal fractional order by experiment.
出处
《电子测量技术》
2015年第11期143-147,共5页
Electronic Measurement Technology
关键词
加权型分数阶傅里叶变换
载波频率偏移
误码率
weighted-type fractional Fourier transform (WFRFT)
carrier frequency offset (CFO)
bit error rate (BER)